Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
  • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
  • C09J133/04—Homopolymers or copolymers of esters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
  • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
  • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
  • B05C11/1034—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves specially designed for conducting intermittent application of small quantities, e.g. drops, of coating material
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
  • C09J133/04—Homopolymers or copolymers of esters
  • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
  • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement

Definitions

• the present invention relates to fluid dispensers, and more particularly, to precision fluid dispensers configured with a zero displacement sealing device.
• a ceramic positive displacement pump is currently available in the market to remedy this issue stated above.
• a ceramic piston is fitted into a ceramic cylinder.
• the piston is sealed using an acidic fluid that is pumped between the cylinder and piston to ensure that the adhesive does not bond the two components together.
• this pump is dependable.
• the ceramic positive displacement pump is complicated to operate and very expensive.
• the pump needs a regular maintenance during shutdown. [0003] Accordingly, although various precision fluid dispensing systems are currently available, further improvements are possible.
• a fluid dispenser for dispensing small doses of fluid includes a dispenser housing, a diaphragm assembly, a displacement chamber, and a dispensing luer.
• the dispenser housing has a first end for receiving the fluid and a second end for dispensing the fluid.
• the dispenser housing defines a fluid flow path from a receiving chamber adjacent the first end to a dispensing chamber adjacent the second end.
• the diaphragm assembly includes a first diaphragm within the receiving chamber and a second diaphragm within the dispensing chamber wherein the first diaphragm is operably connected to the second diaphragm.
• the diaphragm assembly is movable between a first position wherein the first diaphragm moves the fluid from the receiving chamber to the dispensing chamber along the fluid flow path and a second position wherein the second diaphragm moves the fluid from the dispensing chamber to the displacement chamber.
• the displacement chamber is positioned adjacent the second end of the housing in communication with the dispensing chamber.
• the dispensing luer is in communication with the displacement chamber for dispensing the small doses of fluid upon movement of the diaphragm assembly to the second position.
• Figure 1 is a perspective view of a fluid dispenser, according to an embodiment of the present invention.
• Figure 2 is a cross-sectional view taken along line A-A of Figure 1, in a first/open position;
• Figure 3 is a cross-sectional view taken along line A-A of Figure 1, in a second/closed position.
• a fluid dispenser 10 designed and configured to dispense small and precise doses of fluid (e.g., an adhesive such as cyanoacrylate and anaerobically curable ones).
• the fluid dispenser 10 includes a dispenser housing 12, a displacement chamber 14 defined within the dispenser housing 12, a dispensing luer 16 for dispensing the small doses of fluid, and a zero displacement sealing device (a diaphragm assembly) 18 arranged within the dispenser housing 12 for allowing the fluid dispenser 10 to dispense consistent and precise volume of fluid, as will be described in greater detail below.
• Directional terms, such as upward and downward are referenced to an orientation in which the dispensing luer 16 of the fluid dispenser 10 is pointing downward.
• the present invention is not thereby limited to use in any particular orientation.
• the dispenser housing 12 is elongate and extends between a first end 20 and a second end 22.
• the first and second ends 20, 22 are for receiving the fluid and for dispensing the fluid, respectively, as will be described in greater detail below.
• a fluid input fitting hole 24 and a plurality of air fitting holes 26 are defined in a first end portion 28 of the dispenser housing 12 and in a middle portion 30 of the dispenser housing 12, respectively.
• a part of a fluid input fitting 32 and a part of an air fitting 34 are inserted and attached through the fluid input fitting hole 24 and the air fitting hole 26, respectively.
• the fluid input fitting 32 provides a fluid path between a fluid reservoir (not shown) and the fluid dispenser 10, whereas air is supplied to the fluid dispenser 10 through the plurality of air fittings 26 with an air pressure, preferably, 60 psi.
• the fluid is pressurized, preferably, between 5 psi and 50 psi.
• the receiving chamber 36 is defined adjacent the first end 20 of the dispenser housing 12
• the dispensing chamber 38 is defined adjacent the second end 22 of the dispenser housing 12.
• the dispenser housing 12 further defines a fluid flow path from the receiving chamber 36 to the dispensing chamber 38 for the fluid to travel therebetween. More specifically, a fluid tube 40 is disposed within the dispenser housing 12 to accommodate the fluid flow path therewithin.
• the fluid tube 40 is configured and arranged such that end portions 42 of the fluid tube 40 are horizontally disposed within the first end portion 28 and second end portion 44 of the dispenser housing 12, and a middle portion 46 of the fluid tube 40 is vertically disposed within the dispenser housing 12, with each end of the middle portion 46 of the fluid tube 40 connecting to each end of the end portions 42 of the fluid tube 40, as show in Figures 2 and 3.
• the fluid then travels along the fluid flow path via the fluid tube 40 and fills the receiving chamber 36, the dispensing chamber 38, and the displacement chamber 14.
• the diaphragm assembly 18 is arranged within the dispenser housing 12 and acts as a device for volumetric displacement of the fluid contained within the receiving chamber 36 and the dispensing chamber 38.
• the diaphragm assembly 18 includes substantially identical first and second diaphragms 48, 50, with the first diaphragm 48 arranged within the receiving chamber 36 and the second diaphragm 50 arranged within the dispensing chamber 38. This arrangement allows a lower end of the receiving chamber 36 and an upper end of the dispensing chamber 38 to be defined by the first diaphragm 48 and the second diaphragm 50, respectively.
• the first diaphragm 48 is operably connected to the second diaphragm 50 for movement between a first/open position ( Figure 2) and a second/closed position ( Figure 3).
• the first and second diaphragms 48, 50 are connected to each end of a connecting rod 56, respectively, which is disposed vertically within the dispenser housing 12 and bolted to an actuator 58.
• the length of an actuator stroke may be adjusted with a stroke adjuster 59.
• the movement of the first and second diaphragms 48, 50 will be described in greater detail below.
• the fluid dispenser 10 further includes a displacement rod 60, which is disposed within the dispenser housing 12 and is positioned above the displacement chamber 14.
• the displacement chamber 14 is defined adjacent the second end 22 of the dispenser housing 12 and is in communication with the dispensing chamber 38.
• the fluid dispenser 10 is made of one or more materials having suitable properties for a desired application, including strength, weight, rigidity, etc. Steel is preferred for the fluid dispenser 10.
• the receiving and dispensing chambers are configured and dimensioned such that they are substantially identical.
• the diaphragm assembly 18 In operation of the fluid dispenser 10, before the fluid dispenser 10 dispenses the fluid, the diaphragm assembly 18 is initially in the first/open position, as shown in Figure 2. In this position, the first diaphragm 48 and the second diaphragm 50 are fully extended and retracted, respectively, such that the fluid to be dispensed is contained within the dispensing chamber 38.
• the actuator 58 moves the connecting rod 56 linearly downward to reverse the position of each of the first and second diaphragms 48, 50 such that the diaphragm assembly 18 transitions to the second/closed position, as shown in Figure 3.
• the first diaphragm 48 and the second diaphragm 50 are fully retracted and extended, respectively, such that the receiving chamber 36 is filled with the fluid to be dispensed, and the fluid in the dispensing chamber.38 is moved to the displacement chamber 14 by the force exerted by the extension of the second diaphragm 50.
• the fluid volume in the dispensing chamber 38 decreases, and the fluid volume in the receiving chamber 36 increases. Since the receiving and dispensing chambers 36, 38 are substantially identical, when the fluid dispenser 10 dispenses the fluid, the volumetric
• displacement of the fluid in the receiving chamber 36 is equal to the volumetric displacement of the fluid in the dispensing chamber 38.
• the actuator 58 also moves the displacement rod 60 downward, forcing the displacement rod 60 to be placed within the displacement chamber 14.
• the displacement rod 60 pushes the fluid in the
• the dispensing luer 16 then dispenses the fluid from the fluid dispenser 10.
• the diaphragm assembly 18 provides a higher energy transfer from the actuator
• first and second diaphragms 48, 50 are unitized.
• This unitized sealing method creates a precise volume of the fluid to be dispensed and also creates a force balance between the first and second diaphragms 48, 50 as they move together.
• the force require to move the first and second diaphragms 48, 50 approaches zero as the projected area of one diaphragm increases and the other diaphragm decreases.
• the actuator 58 moves the diaphragm assembly 18 linearly upward and transitions the diaphragm assembly 18 back to the first position.
• the first diaphragm 48 and the second diaphragm 50 are fully extended and retracted, respectively.
• the force exerted by the extension of the first diaphragm 48 allows the fluid in the receiving chamber 36 to move to the dispensing chamber 38 along the fluid flow path for dispensing.
• a fluid dispenser according to the present invention dispenses small doses of fluid while enhancing precision of fluid volume to be dispensed and longevity of the fluid dispenser.
• the foregoing description is provided for exemplary and illustrative purposes; the present invention is not necessarily limited thereto. Rather, those skilled in the art will appreciate that additional modifications, as well as adaptations for particular circumstances, will fall within the scope of the invention as herein shown and described and of the claims appended hereto.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Coating Apparatus (AREA)
• Reciprocating Pumps (AREA)
• Nozzles (AREA)
• Devices For Dispensing Beverages (AREA)

Applications Claiming Priority (2)

Publications (3)

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Family Applications (1)

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• 2018
  • 2018-08-29 CN CN201880055455.XA patent/CN111065466B/zh active Active
  • 2018-08-29 WO PCT/US2018/048543 patent/WO2019046425A1/en not_active Ceased
  • 2018-08-29 KR KR1020207006838A patent/KR102525478B1/ko active Active
  • 2018-08-29 EP EP18851920.1A patent/EP3676021B1/de active Active
  • 2018-08-29 JP JP2020512451A patent/JP7541919B2/ja active Active
• 2020
  • 2020-02-24 US US16/798,514 patent/US11173514B2/en active Active

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